noaa-recon-11920 North Iceland Shelf Holocene Diatom August SST Reconstruction Justwan, A.; Koç, N.; Jennings, A.E. North Iceland Shelf Holocene Diatom August SST Reconstruction 2011-08-08 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/11920 Investigator A. Justwan Investigator N. Koç Investigator A.E. Jennings earth science paleoclimate climate reconstructions|paleoceanography depth,null,null,centimeter,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,diatom assemblage,null,degree Celsius,Aug,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography age,null,null,calendar year before present,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate reconstructions sea surface temperature geoscientificInformation Sea Surface Temperature Reconstruction 11477 cal yr BP -16 cal yr BP Complete 66.63 66.63 -23.85 -23.85 -365 -365 Ocean Atlantic Ocean North Atlantic Ocean MD99-2269>LATITUDE 66.63>LONGITUDE -23.85 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Justwan, A., N. Koç, and A.E. Jennings. 2008. Evolution of the Irminger and East Icelandic Current systems through the Holocene, revealed by diatom-based sea surface temperature reconstructions. Quaternary Science Reviews, Vol. 27, pp. 1571-1582, doi:10.1016/j.quascirev.2008.05.006

Sediment core MD99-2269, from the northern shelf of Iceland, has been studied to assess the stability of the East Icelandic-Irminger Current system during the Holocene. The 25.4m long Holocene section was studied with a 40 years average resolution. The chronology is based on the combination of 24 14C AMS dates and two tephra layers. Diatoms are utilized to quantify the development and variability of the August sea surface temperature (SST) for the last 11.5 cal kyr BP. Three different transfer function methods have been used to reconstruct August SST at the site: weighted average-partial least squares (WA-PLS), maximum likelihood (ML) and Imbrie and Kipp (I&K). The combined use of the three methods allows the August SST reconstruction with a higher confidence level than with using only one statistical technique. These three reconstructions generate very similar August SST trends through the Holocene. The onset of the Holocene climate optimum is characterized at the site by a rapid August SST increase at 10.4 cal kyr BP of almost 4°C. The Holocene climate optimum is recorded between 10.4 and 4.7 cal kyr BP. The August SSTs were around 2°C warmer during the major part of the Holocene compared with the August SSTs for the later half of the Holocene. Combining the diatom record with the benthic foraminifera records from the same core enables us to reconstruct the evolution of both surface and bottom water masses during the Holocene. This reconstruction shows dominance of the Arctic waters throughout the water column at the onset of the Holocene, and subsequent increase of the influence of the Atlantic water, especially during the Holocene climate optimum. This strong dominance of Atlantic water tends to decrease between 4.7 and 2.2 cal kyr BP, especially in the upper part of the water column. Since 2.2 cal kyr BP the trend is reversed, suggesting an increased influence of Atlantic water at least in the upper water column. STUDY NOTES: August Sea Surface Temperature (SST) record from marine sediment core MD99-2269 from the northern shelf of Iceland for the last 11.5 cal kyr BP. The SST reconstruction is based on fossil diatom assemblages and the weighted averaging partial least squares (WA-PLS) transfer function method. A 25.4 m long sediment core MD99-2269 was collected from the northern Icelandic shelf during IMAGES cruise Leg 4 in 1999 aboard the French research vessel Marion Dufresne. The age model of the core MD99-2269 is based on the correlation between the cores MD99-2269 and MD99-2322 (Stoner et al. 2007).

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/justwan2008/justwan2008.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/justwan2008/justwan2008.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11